Interfitting corner construction



July 24, 1923- E. OHNSTRAND INTEHFITTING CORNER CONSTRUCTION Filed Jan. 28, 1922 iuzgmlg vfiweni'av": I 32007; OhwMavuZ, 3 W, MY

Patented July 24, 1923.

UNITED STATES PATENT OFFICE.

ENOCH OHNSTRAND, OF MOHAVJK, NEJV YORK, ASSIGNGR TO LIBRARY BUREAU, OF CAMBRTDGE, MASSACHUSETTS, A COREOBATION OF NEVI JERSEY.

INTERFITTING CORNER- CONSTRUCTION.

Application filed January 28, 1922.

To all whom it may oonoem:

Be it known that I, ENoci-r OHNSTRAND, a citizen of the United States of America, and resident of Mohawk, in the county of Herkimer and State of New York, have invented new and useful Improvements in Interfitting Corner Constructions, of which the following is a specification.

This invention relates to intermembered corner construction for frames of structures in which great strength and rigidity is de sired. It is particularly adapted to vaults, safes, filing cases, and other cabinets which may be subjected to heavy shocks and strains, as for example in a fire.

The above mentioned containers usually have an outer frame of angle iron protecting all edges and corners. Heretofore the corners have ordinarily been constructed by mitering the angle irons, assembling the irons with the mitered edges in contact, and uniting the irons along the miter-ed edges by welding. Inasmuch as such a corner has but two meeting edges for each angle iron (one for each flange) and no overlapping or interfiitting of the parts, it is liable to open up along the welded joint under heavy shock or strain such as frequently occurs during a fire.

Objects of the invention are to produce an improved and strengthened corner construc tion, to provide interfitting portions on the three angle members at their point of union to make a corner, to provide more than two meeting edges for each angle member, and in general to obviate the weakness of prior corner constructions.

The invention comprises metal bars meeting at a corner and having mutually fitting edges lying in the direction of the bars and mutually fitting edges lying across said eirection. The edges are conjoined preferably by a. fused metallic joint as by welding. The invention further comprises corner construction for frames constructed of bars in the form of angle irons and a projection upon one iron joined to both flanges of an adjacent iron. The projection may be coplanar with one flange of either of said irons. The projection which is preferably formed by terminating one flange of the angle iron short of the other flange is arranged to extend into a recess complemental thereto in another angle iron. The invention further comprises a frame composed of Serial No. 532,447.

three angle irons interconnected together at their ends in angular relationship to each other, each iron having one side terminating short of the other side to form the end a projection and recess, each projection ting in a recess in one of the other irons.

In order to illustrate the invention one concrete embodiment thereof is shown in tl accompanying drawing, in which Fig. 1 is a perspective view of a safe enibodying the features of the invention;

Fig. 2 isan enlarged perspective view of an assembled corner before welding; and

F 3 is a perspective view similar to Fig: :2 after welding.

Fig. 4 is a sectional View on the line fll of Fig. 2.

The invention is illustrated in connection with a lire resistant cabinet or A havii o an outer frame B of angle iron, double doo C pivoted at D to the frame, lock dial E, and bolt operating handles F.

The particular form of intcrfitting corner construction chosen to illustrate the invention is best shown in Fig. 2 in which a corier of frame B is shown in perspective prior to welding. Frame B comprises bars or angle irons having fia .ges i and 5. To form strong interfitting joint one flange of each angle iron is extended beyond the other in. the form of a projection or tongue 6. projection may be produced by cuttii the other flange 4c to the required. distanc by making a V-shaped recess therein. The treatment of all of the angle irons is identical. The irons are then assembled as illustrated in Fig. 2, the meeting edges of the flanges lying in the same plane being beveled as indicated at 7 so that the sin cent all the meeting edges are dis stantially at an angle of irons after assembly are tightly clamped position and are united by welding, prefer ably with an electric welding macl'ii e usin 1*. a fusible electrode, along the meetiedges, the welding metal completely filling the grooves between the surfaces and joining the parts into a solid integral mass. When the excess metal has been smoothed away no trace whatever of a joint appears as indicated in Fig. 3.

From the foregoing in will be evident that in place of two meeting edges for each angle iron (one on each flange as in the mitered corner of the prior art) at least three meetiron has four meeting edges. General interengagement of the parts is produced by proection 6 on each angle iron which is made fast to both flanges of an adjacent iron. 1 Th s lnterflttlng eflected by pro ections recelved in complemental recesses 1n LClTACQHiI irons together With the Welding thereof into an integral structure produces an excep tionally strong corner Which efleotively resists shocks and strains which the ordinary mitered corner cannot Withstand.

I claim:

1. Corner construction for frames constructed of angle-irons comprising a projection upon one ironjoined to both flanges of an adjacent iron.

2. Corner construction for frames constructed oi angle-irons comprising a projection co-planar With one flange of one iron directly connected to both flanges of an adj acent iron. I

3. Corner construction for frames constructed of angle-irons comprising, a projection upon one iron fast to both flanges of a second iron,,said projection being .co-planar with one flange of said second iron.

4h Corner construction for angle-iron frames comprising a projection on one iron co-planar with one flange thereof, said projection extending in the plane of one flange of another iron tothe other flange thereof. and means uniting the projection to both flanges of said second named iron.

5. Corner construction for three angleirons meeting to form a corner comprising a projection upon each iron engaging both flanges of an adjacent iron, the meeting edges of the projections and flanges being integrally united whereby a rigid interfltting 'Derppndicular thereto, the other flange of eachv iron being recessed to receive in its plane the extension ot another lI'OIl, the

meeting edges of said irons being integrally united. I

'Z. A trame tor cabinets and the like comprising a plurality of angle-irons interconnected together at their ends, each angleiron having one flange terminating short of the other flange to form a projection and a ii-shaped recess at the end thereof, each projection extending into the recess of another angle-iron and being integrally secured thereto along both edges of the V-shaped recess.

8. A frame for cabinets and the like comprising three angle-irons interconnected together at their ends in angular relationship to each other, each angle-iron having a projection extending into a recess in one of the other angle-irons. V l

9. A frame for cabinets and the like com prising three angle-irons interconnected to.- gether at their ends in angular relationship 11. A cabinet having angle-irons fitting over the three meeting edges .at/afcorner thereof and overlapping the three sides of the cabinet adjacent the corner, each angle iron having one; flange terminating short of the otherflange to form a projection and arecess at the end thereof, the recess of one angle-iron and the projection U of another angle-iron bein'g'located on each of said three sides in interfitting relationship.

12. A. cabinet having angle-irons fli zting overthe three meeting edges at a corner thereof and overlapping the three sides of the cabinet adjacent the corner, each angleiron having one flange terminating short of the other flange to form a projection and a V-shaped recess at the end'thereof, the recess of one angle-iron and the projection of another angle-iron being located on each of said three sides in interfitt-ing relationship and each projection being secured to its interlitting recess along both edges of therecess.

Signed by me at Mohawk, N. Y., this 24th day of January 1922.

ENOCH OHNSTRAND. 

